US4144227A
Expired / Lapsed
US
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Novel copolymers and diaphragms made therefrom
Assignee: De Nora SpA
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Filing: 1977-02-04
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Granted: 1979-03-13
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Expires: 1997-02-04
Abstract
Abstract Novel sulfonated copolymers formed by copolymerization of a halogenated monomer containing at least one fluorine atom and a monomer of the formula ##STR1## wherein X is an electron attracting group activating the hydrogen atom in the α-position so that the hydrogen may be replaced with a sulfonic group and Y is selected from the group consisting of hydrogen, methyl and ethyl and their preparation, novel diaphragms made therefrom, a diaphragm cell equipped with a diaphragm made of said sulfonated copolymer and to a method of electrolysis.
Inventors
- 👤 Luigi Giuffre
- 👤 Vittorio De Nora
- 👤 Placido Spaziante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:52
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A water-wettable and water-insoluble at least 60% sulfonated copolymer of (A) a monomer of the formula Y--CH═CH--X wherein X is --COOH and Y is selected from the group consisting of hydrogen, methyl and ethyl and (B) a halogenated monomer of the formula ##STR5## wherein R is halogen and Y', Y" and Y'" are individually halogen with the proviso that at least one of the Y's is fluorine, and the sulfonic acid group is attached to the carbon atom α to the --COOH group, the ratio of B to A being 1:2.5 to 1:42.
Claim 2
Dependent Claim
93 words
A water-wettable and water-insoluble at least 60% sulfonated copolymer of (A) a monomer of the formula Y--CH═CH--X wherein X is --COOH and Y is selected from the group consisting of hydrogen, methyl and ethyl and (B) a halogenated monomer of the formula ##STR5## wherein R is halogen and Y', Y" and Y'" are individually halogen with the proviso that at least one of the Y's is fluorine, and the sulfonic acid group is attached to the carbon atom α to the --COOH group, the ratio of B to A being 1:2.5 to 1:42.
Claim 3
Dependent Claim
22 words
The copolymer of claim 1 wherein the halogenated monomer is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, bromotrifluoroethylene, vinylidenefluorine and hexafluoropropylene.
Claim 4
Dependent Claim
24 words
The polymer of claim 1 wherein the molecular weight of the polymer is between 2 × 10 4 and 4 × 10 6 .
Claim 5
Dependent Claim
17 words
The copolymer of claim 1 wherein the halogenated monomer is tetrafluoroethylene and the co-monomer is acrylic acid.
Claim 6
Dependent Claim
19 words
The copolymer of claim 4 wherein the molar ratio between tetrafluoroethylene and acrylic acid is between 7:1 and 25:1.
Claim 7
Dependent Claim
20 words
The copolymer of claim 5 wherein the molar ratio between acrylic acid and sulfonic acid is between 1:0.6 and 1:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |